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29 September, 20:15

Sarah has 6 friends who are available to go with her to the movies, but she only has 2 extra tickets. How many different choices does Sarah have for which 2 friends to invite.

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  1. 29 September, 20:58
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    Person 1: 5 choices to pair with

    Person 2: 4 choices

    Person 3: 3 choices

    Person 4: 2 choices

    Person 5: 1 choice

    Therefore, she has 15 choices for which 2 friends to invite
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